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7. Let f(x,y) =e-(x+y), x20, y20 be the joint p.d.f. of X and Y . Find the p.d.f. of U =X+Y . (g(u) =ue- ,

7. Let f(x,y) =e-(x+y), x20, y20 be the joint p.d.f. of X and Y . Find the p.d.f. of U =X+Y . (g(u) =ue-" , u 20)

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